Thanks for reply. I did wonder why not every one gets a permit aircraft, as they're much cheaper to run by the looks of things, and seem to be more modern as well. I guess its because they're rare...
The more modern ones are by no means cheap. Also they are usually (but not entirely) 2-seaters. There aren't many 4-seaters available on Permit.
In my view it's about what your mission is and for some Permit will be right and for others CofA is better.